The patch titled
sysfs: crash debugging
has been removed from the -mm tree. Its filename was
sysfs-crash-debugging.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: sysfs: crash debugging
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Print the name of the last-accessed sysfs file when we oops, to help track
down oopses which occur in sysfs store/read handlers. Because these oopses
tend to not leave any trace of the offending code in the stack traces.
Cc: Greg KH <greg@xxxxxxxxx>
Cc: Kay Sievers <kay.sievers@xxxxxxxx>
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/i386/kernel/traps.c | 1 +
arch/x86_64/kernel/traps.c | 1 +
fs/sysfs/file.c | 14 ++++++++++++++
include/linux/sysfs.h | 5 +++++
4 files changed, 21 insertions(+)
diff -puN arch/i386/kernel/traps.c~sysfs-crash-debugging arch/i386/kernel/traps.c
--- a/arch/i386/kernel/traps.c~sysfs-crash-debugging
+++ a/arch/i386/kernel/traps.c
@@ -416,6 +416,7 @@ void die(const char * str, struct pt_reg
#endif
if (nl)
printk("\n");
+ sysfs_printk_last_file();
if (notify_die(DIE_OOPS, str, regs, err,
current->thread.trap_no, SIGSEGV) !=
NOTIFY_STOP) {
diff -puN arch/x86_64/kernel/traps.c~sysfs-crash-debugging arch/x86_64/kernel/traps.c
--- a/arch/x86_64/kernel/traps.c~sysfs-crash-debugging
+++ a/arch/x86_64/kernel/traps.c
@@ -521,6 +521,7 @@ void __kprobes __die(const char * str, s
printk("DEBUG_PAGEALLOC");
#endif
printk("\n");
+ sysfs_printk_last_file();
notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
show_registers(regs);
add_taint(TAINT_DIE);
diff -puN fs/sysfs/file.c~sysfs-crash-debugging fs/sysfs/file.c
--- a/fs/sysfs/file.c~sysfs-crash-debugging
+++ a/fs/sysfs/file.c
@@ -9,12 +9,20 @@
#include <linux/poll.h>
#include <linux/list.h>
#include <linux/mutex.h>
+#include <linux/limits.h>
#include <asm/uaccess.h>
#include "sysfs.h"
#define to_sattr(a) container_of(a,struct subsys_attribute, attr)
+/* used in crash dumps to help with debugging */
+static char last_sysfs_file[PATH_MAX];
+void sysfs_printk_last_file(void)
+{
+ printk(KERN_EMERG "last sysfs file: %s\n", last_sysfs_file);
+}
+
/*
* Subsystem file operations.
* These operations allow subsystems to have files that can be
@@ -245,6 +253,12 @@ static int sysfs_open_file(struct inode
struct sysfs_buffer * buffer;
struct sysfs_ops * ops = NULL;
int error;
+ char *p;
+
+ p = d_path(file->f_dentry, sysfs_mount, last_sysfs_file,
+ sizeof(last_sysfs_file));
+ if (p)
+ memmove(last_sysfs_file, p, strlen(p) + 1);
/* need attr_sd for attr and ops, its parent for kobj */
if (!sysfs_get_active_two(attr_sd))
diff -puN include/linux/sysfs.h~sysfs-crash-debugging include/linux/sysfs.h
--- a/include/linux/sysfs.h~sysfs-crash-debugging
+++ a/include/linux/sysfs.h
@@ -133,6 +133,7 @@ void sysfs_remove_file_from_group(struct
const struct attribute *attr, const char *group);
void sysfs_notify(struct kobject * k, char *dir, char *attr);
+void sysfs_printk_last_file(void);
extern int __must_check sysfs_init(void);
@@ -234,6 +235,10 @@ static inline int __must_check sysfs_ini
return 0;
}
+static inline void sysfs_printk_last_file(void)
+{
+}
+
#endif /* CONFIG_SYSFS */
#endif /* _SYSFS_H_ */
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
revert-ecryptfs-fix-lookup-error-for-special-files.patch
process_zones-fix-recovery-code.patch
remove-bdput-from-do_open-in-fs-block_devc.patch
slow-down-printk-during-boot.patch
slow-down-printk-during-boot-fix-2.patch
git-acpi.patch
acpi-add-reboot-mechanism.patch
git-alsa.patch
working-3d-dri-intel-agpko-resume-for-i815-chip.patch
revert-gregkh-driver-block-device.patch
revert-gregkh-driver-warn-when-statically-allocated-kobjects-are-used.patch
git-dvb.patch
git-dvb-fixup-2.patch
infiniband-work-around-gcc-slub-problem.patch
adbhid-produce-all-capslock-key-events.patch
iforce-warning-fix.patch
console-keyboard-events-and-accessibility-fix.patch
console-keyboard-events-and-accessibility-fix-2.patch
git-kbuild.patch
git-kvm.patch
git-libata-all.patch
ata-add-the-sw-ncq-support-to-sata_nv-for-mcp51-mcp55-mcp61patch.patch
ide-arm-hack.patch
git-mmc.patch
git-mmc-fixup2.patch
gregkh-driver-driver-core-change-add_uevent_var-to-use-a-struct-vs-git-mmc.patch
git-mtd.patch
git-netdev-all.patch
e1000e-build-fix.patch
revert-8139too-clean-up-i-o-remapping.patch
git-net.patch
git-net-fixup.patch
git-backlight.patch
git-nfs-vs-git-unionfs.patch
git-nfsd.patch
revert-gregkh-pci-pci_bridge-device.patch
pci-remove-irritating-try-pci=assign-busses-warning.patch
fix-ide-legacy-mode-resources-fix.patch
git-s390.patch
git-scsi-misc.patch
advansys-printk-fix.patch
git-block-fixup.patch
git-block-fix-headers_check.patch
git-unionfs.patch
git-unionfs-build-fix.patch
git-unionfs-fix-2.patch
fix-gregkh-usb-usb-sisusb2vga-convert-printk-to-dev_-macros.patch
git-wireless.patch
git-wireless-fixup.patch
git-wireless-vs-gregkh-driver-driver-core-change-add_uevent_var-to-use-a-struct.patch
git-wireless-printk-fixes.patch
net-add-ath5k-wireless-driver-fix.patch
x86_64-get-mp_bus_to_node-as-early-v3.patch
ich-force-hpet-ich7-or-later-quirk-to-force-detect-enable-fix.patch
ich-force-hpet-ich5-quirk-to-force-detect-enable-fix.patch
git-xfs.patch
git-xtensa.patch
git-xtensa-fixup.patch
git-kgdb-fixup.patch
vmscan-give-referenced-active-and-unmapped-pages-a-second-trip-around-the-lru.patch
sparsemem-record-when-a-section-has-a-valid-mem_map-fix.patch
readahead-combine-file_ra_stateprev_index-prev_offset-into-prev_pos-fix.patch
readahead-combine-file_ra_stateprev_index-prev_offset-into-prev_pos-fix-2.patch
vm-dont-run-touch_buffer-during-buffercache-lookups.patch
alloc_pages-permit-get_zeroed_pagegfp_atomic-from-interrupt-context.patch
fs-introduce-write_begin-write_end-and-perform_write-aops.patch
git-nfs-vs-nfs-convert-to-new-aops.patch
memoryless-nodes-introduce-mask-of-nodes-with-memory-fix.patch
categorize-gfp-flags-fix.patch
bias-the-location-of-pages-freed-for-min_free_kbytes-in-the-same-max_order_nr_pages-blocks.patch
maps2-move-the-page-walker-code-to-lib.patch
maps2-add-proc-pid-pagemap-interface.patch
maps2-make-proc-pid-smaps-optional-under-config_embeddedpatch-fix.patch
slub-slab-validation-move-tracking-information-alloc-outside-of-melstuff.patch
hugetlbfs-read-support-fix.patch
mm-mempolicyc-cleanups-fix.patch
security-convert-lsm-into-a-static-interface-fix.patch
security-convert-lsm-into-a-static-interface-fix-2.patch
security-convert-lsm-into-a-static-interface-fix-unionfs.patch
security-convert-lsm-into-a-static-interface-vs-fix-null-pointer-dereference-in-__vm_enough_memory.patch
file-capabilities-clear-caps-cleanup-fix.patch
capabilityh-remove-include-of-currenth.patch
serial-turn-serial-console-suspend-a-boot-rather-than-compile-time-option-update.patch
cache-pipe-buf-page-address-for-non-highmem-arch.patch
softlockup-add-a-proc-tuning-parameter-fix.patch
force-erroneous-inclusions-of-compiler-h-files-to-be-errors-fix.patch
driver-for-the-atmel-on-chip-ssc-on-at32ap-and-at91-fix.patch
add-kernel-notifierc-fix.patch
do_sys_poll-simplify-playing-with-on-stack-data-fix.patch
pcmcia-compactflash-driver-for-pa-semi-electra-boards.patch
add-in-sunos-41x-compatible-mode-for-ufs-fix.patch
core_pattern-fix-up-a-few-miscellaneous-bugs-fix.patch
printk-add-interfaces-for-external-access-to-the-log-buffer-fix.patch
deprecate-aout-elf-interpreters-fix.patch
ext2-ext3-ext4-add-block-bitmap-validation-fix.patch
pie-executable-randomization-fix-2.patch
binfmt_flat-warning-fixes.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-2.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-3.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-4.patch
writeback-fix-comment-use-helper-function.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-5.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-6.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-7.patch
revert-faster-ext2_clear_inode.patch
ecryptfs-printk-warning-fixes.patch
tdfxfb-mtrr-support-fix.patch
fbdev-fb_create_modedb-non-static-int-first-=-1-fix.patch
intel-iommu-pci-generic-helper-function.patch
intel-iommu-iova-allocation-and-management-routines.patch
intel-iommu-intel-iommu-driver.patch
intel-iommu-iommu-floppy-workaround.patch
64-bit-i_version-afs-fixes.patch
revoke-wire-up-i386-system-calls.patch
revoke-vs-git-block.patch
task-containersv11-basic-task-container-framework-fix.patch
add-containerstats-v3-fix.patch
pid-namespaces-dynamic-kmem-cache-allocator-for-pid-namespaces-fix.patch
pid-namespaces-define-is_global_init-and-is_container_init-fix.patch
pid-namespaces-define-is_global_init-and-is_container_init-versus-x86_64-mm-i386-show-unhandled-signals-v3.patch
fs-superc-use-list_for_each_entry-instead-of-list_for_each-fix.patch
pid-namespaces-helpers-to-find-the-task-by-its-numerical-ids-fix.patch
pid-namespaces-changes-to-show-virtual-ids-to-user-use-find_task_by_pid_ns-in-places-that-operate-with-virtual-fix.patch
pid-namespaces-changes-to-show-virtual-ids-to-user-use-find_task_by_pid_ns-in-places-that-operate-with-virtual-fix-2.patch
pid-namespaces-changes-to-show-virtual-ids-to-user-use-find_task_by_pid_ns-in-places-that-operate-with-virtual-fix-3.patch
pid-namespaces-changes-to-show-virtual-ids-to-user-fix.patch
reiser4.patch
git-block-vs-reiser4.patch
page-owner-tracking-leak-detector.patch
profile-likely-unlikely-macros-fix.patch
check_dirty_inode_list.patch
w1-build-fix.patch
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